crazy vibration

Causes of Clutch Chatter or Shudder
• Improper break-in procedure
• Flywheel not properly resurfaced before installing a new clutch
• Flywheel or clutch disc friction surface not parallel with the crank flange surface
• Flywheel has severe hard spots or hot spots
• Flywheel has an improper step or cup dimension
• Defective pressure plate and/or disc
• Disc has inadequate or no marcel (not enough cushion between friction facings)
• Oil or grease contamination on clutch facings
• Worn or damaged clutch linkage
• Bent cover assembly and/or clutch disc
• Damaged/excessively worn U-joints or CV joints
• Misaligned U-joints
• Excessive backlash in differential
• Excessive driveline angle
• Improper gear ratio versus tire diameter
• Improperly tuned engine
• Worn/damaged engine or transmission mounts
• Bad leaf springs, bushings or mounts

Also if your engine was align-bored , the bellhousing alignment needs to be checked due to the crank centerline being changed.